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2 charges, 27.81 µC each, are located at two vertices B & C of an equilateral...

2 charges, 27.81 µC each, are located at two vertices B & C of an equilateral triangle ABC with sides 2 cm each. Another charge q is located at point A. Calculate q in micro Coulomb so that net POTENTIAL at the mid point of BC will be ZERO.

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